Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db48f96ab36bda9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 11:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 91f9f466fb22d24acd949b69b3f8efdd SHA-1: 9bad12fbcb36677b9dc2622269f1124e01c2f9c7 SHA-256: 0db48f96ab36bda94448d00d5763fffe656d34f012685e9e49f0e874a5b5a225
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jordan.si/dokumenti/file/juvosix.pdf In PDF document text
    • http://4chan.ro/UserFiles/file/21420006006.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/4866736126.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/kedajepugamorupixojo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/dogigabamugapojusat.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/gunegirikizikofeganozog.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/17598848386.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/14249312991.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/26635500030.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/43919310193.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/32264291585.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613717094286d---75764230874.pdfIn PDF document text
    • https://themalc.org/files/file/13901103495.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gopemawubotad.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/25138029838.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/69509677083.pdfIn PDF document text
    • http://jiab.net/userData/board/file/vetemogezutixumuxezofimo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/varapunekevopifup.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/76a3d6bb664e8b761ca1f3241ca75f0e/buwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=abule+mp3+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10572 bytes
SHA-256: da4a0839655ab80e1cd808a367e54fa9761cec70eaab6dcda8490fe2cd502c64
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 20284 bytes
SHA-256: d89d62d9e760cd4376552614a9128839360fd1c10f5d7c31499960522b55fa94

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